The highest located reservoir in the Czech Republic lies on the Black Nisa, 3 km to the north of Bedřichov and it has been part of the surrounding mountain countryside for one hundred years. The Bedřichov Water Reservoir (sometimes also called the reservoir on the Black Nisa or the Bedřichov Reservoir) was built on the river of the same name, which rises at the foot of Olivetská hora, in 1902–1906. It lies in the highest section of the Jizera Mountains, 3 km to the north of Bedřichov. Its position and the surrounding countryside mean that the reservoir is a popular trip destination. It is only accessible on foot, on skis or by bicycle. In summer, it provides the option of peaceful swimming (with or without a swimming costume), while it is possible to cross-country ski on its frozen surface in winter.